Move LayoutAndPaintAsyncThen to a separate compilation unit.

components/test_runner/web_test_proxy.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_TEST_RUNNER_WEB_TEST_PROXY_H_
 #define COMPONENTS_TEST_RUNNER_WEB_TEST_PROXY_H_
 
 #include <string>
 #include <utility>
 
@@ skipping 65 matching lines @@
   void set_delegate(WebTestDelegate* delegate) {
     DCHECK(delegate);
     DCHECK(!delegate_);
     delegate_ = delegate;
   }
 
   void SetInterfaces(WebTestInterfaces* interfaces);
 
   std::string DumpBackForwardLists();
 
-  void LayoutAndPaintAsyncThen(const base::Closure& callback);
-
   void GetScreenOrientationForTesting(blink::WebScreenInfo&);
 
  protected:
   WebTestProxyBase();
   ~WebTestProxyBase();
 
   blink::WebViewClient* view_test_client() { return view_test_client_.get(); }
 
  private:
   TestInterfaces* test_interfaces_;
@@ skipping 115 matching lines @@
 
  private:
   virtual ~WebTestProxy() {}
 
   DISALLOW_COPY_AND_ASSIGN(WebTestProxy);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_WEB_TEST_PROXY_H_